JPS62143580A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attach a dynamic effect synchronized with a sound signal on a reproduced static image switching dynamically a static image fitted for the sound signal by performing a memory control on a video reproducing system according to a control code stored on a magnetic tape. CONSTITUTION:A sound signal processing circuit 22 demodulates the first sound signal at the first segment 50, and an index signal at an area 58 from the reproducing output signal of a magnetic tape 8, and the sound signal is outputted through a D/A conversion circuit 23, and a noise reduction circuit 24. A picture signal processing circuit 26 demodulates the first static picture signal at the second segment 60, and the index signal at an area 68, and the static picture signal of one field is written on each of field memories 28-31, and is read out selectively, then being outputted from a D/A conversion circuit 33. A control processing circuit 35 decodes a control code included in the index signal, and performs the switching control of memory switches 27, 32, and 37, and performs the read/write control of the static picture signal for the field memories 28-31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a first area of a recording rack formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape. Regarding a magnetic recording and reproducing device such as a so-called 8 mm video tape recorder, which records and reproduces an encoded audio signal through a recording track, and records an image signal through a second area of a recording track, In particular, magnetic recording Nf that records and reproduces still image signals together with audio signals
Regarding raw equipment.

[Summary of the invention]

The present invention provides a magnetic recording and reproducing apparatus for recording and reproducing still image signals together with audio signals, by controlling the memory of the video reproducing system in accordance with the control code recorded on the magnetic tape. , in which still images are dynamically switched in accordance with audio signals.

[Conventional technology]

Conventionally, audio signals are recorded and reproduced through a first region of a recording track formed on a magnetic tape in the running direction of the magnetic tape. A so-called 8 mm video tape recorder is known as a magnetic recording/reproducing device that records and reproduces image signals through the second area of the recording track.

In this 8mm video tape recorder standard, recording and playback are performed using a pair of rotating heads that are spaced 180 degrees from each other, and the magnetic tape is wound within a 221 degree range around the rotational surface of the head. It will be done. The video signal is recorded and played back in a 180° section of this 221°, and the video signal is encoded (PCM) and time-axis compressed in the remaining 36° section.
Recording and playback are now performed.

That is, FIG. 6 shows a 1-rank formant for recording on a magnetic tape according to the above-mentioned standard. Starting from the right side where the head starts to come into contact with the magnetic tape, first, a 5° rotation angle of the head is applied to the leading end. A plunger 51 is provided, and the plunger 5
2.06° in the second half of 1 (3 horizontal periods of the video signal ()
During the period corresponding to 1) minutes, a clan-in section 52 is provided to synchronize with the subsequent PCM data. I) of the time-base compressed audio signal following this run-in part 52
The CM data section 53 is provided over 26.32 degrees.

Following this data section 53, a period <2.06° (3H) is used as a margin section 54 for recording position deviation during after-recording, and after this, a guard margin section 54 is provided for the video section and PCM data section of 2.62°. A section 55 is provided.

Following this guard section 55, a video signal section 56 for one field is provided over 180 degrees. Furthermore, a separation portion 57 of 5° is provided after this.

Therefore, in this standard, one field of video signal is recorded and played back in the video signal section 56, and the audio signal for 1760 seconds during this period is converted into PCM, and after processing such as error correction, approximately 176 seconds of audio signal is recorded and played back. The time axis is compressed to 8° and recorded and reproduced as PCMC-data 3. Question record 1
- Rays are sequentially provided obliquely in the longitudinal direction of the magnetic tape, and continuous video signals and audio signals are recorded and reproduced.

By the way, in the above-mentioned standard, one of the video signal sections 56
If you divide 80° into 5 equal parts, each part will be 36°. on the other hand,
PCMC-data 3, 5° of the entry portion 51, 2.06° of the subsequent bank margin portion 54, and 2 of the guard portion 55.
．． Adding 62° gives exactly 36°. Therefore, a multi-segment PCM recorder exclusively for audio signals has been proposed by utilizing the device of the above-mentioned standard.

FIG. 7 shows an example of a recording track format for this purpose. In FIG. 7, the section from the protrusion section 51 on the side where the heads begin to come into contact with each other to the guard section 55 is equivalent to the "double series" standard, and this section is defined as the first segment. Next, from the start side of the conventional video signal section 56, an entry section 61, a line-in section 62, a data section 63, a margin section 64, and a guard section 65 having the same configuration as described above are provided.
This section is defined as the second segment. Furthermore, this second
A structure similar to the segment is repeatedly provided every 36 degrees of the video signal portion 56, and these segments are respectively defined as third to sixth segments. After this, a separation portion 57 of 5° is provided.

As a result, the first to sixth segments are provided. Then, for each of these segments, the rotation angle position of the rotary head is detected, and PCM data is output at a time corresponding to a predetermined segment (section), each 36 degrees from the contact start end side of the head. In addition to recording, Fj
By gating and reproducing that time of the raw signal,
Each segment can be recorded and reproduced independently.

When recording again on a magnetic tape that has been used once, a so-called flying erase head is used to drive the head only during the time it is in contact with the desired segment section, thereby erasing only that section. It is possible to selectively erase and re-record.

In this way, PCM audio signals can be recorded and played back independently in each section of the magnetic tape divided into six widthwise sections. It is possible to record and reproduce PCM audio signals.

Furthermore, in a multi-segment I-1-' CM recorder dedicated to PCM audio signals over a long period of time, it is required to further include an image signal recording and reproducing function.
PCMC- of the above-mentioned 8mm video tape recorder standard
A method of recording an encoded image signal in data 3 when there is no audio signal (see Japanese Patent Laid-Open No. 164383/1983)
has been proposed, but it has not been possible to record and reproduce audio and video signals at the same time.

[Problem that the invention seeks to solve]

Since it is not possible to record and reproduce an audio signal and a video signal at the same time using the conventional technology as described above, the present applicant recorded a still image signal in a second area on the same track as the recording track of the encoded audio signal. He first proposed a magnetic recording device that could record audio and video signals simultaneously by encoding them (Japanese Patent Application No. 1986-20).
No. 4991).

By the way, in a magnetic recording device that records audio signals and still image signals in this way, when the still image signal is recorded for one horizontal period (LH) in the PCM data section of one segment, the playback device can record the still image signal for one horizontal period (LH). It takes about 4 seconds to reproduce a still image, and since the reproduced screen does not change except every 4 seconds, there is a problem that the image changes monotonically with respect to the audio signal.

In view of the above-mentioned problems, the present invention provides an audio signal encoded through a first area of a recording track formed on a magnetic tape in a direction oblique to the running direction of the magnetic tape. In a magnetic recording and reproducing device that records and reproduces encoded still image signals via the second area of the recording track, the still image can be dynamically changed in accordance with the audio signal. The purpose is to

[Means for solving problems]

In order to solve the problem of upper j-h and j1-h points, the present invention provides recording through a first area of a recording track formed on a magnetic tape in a direction diagonal to the running direction of the magnetic tape. In addition to recording and reproducing the emerged audio signal, still image interleaving-J is encoded via the second area of the recording track.
- a magnetic recording and reproducing apparatus for recording and reproducing a still image, a plurality of field memories for storing still image frames reproduced from the magnetic tape; and a plurality of field memories for storing still images reproduced from the magnetic tape; The present invention is characterized in that it is provided with memory control means for controlling writing and reading of still image signals in the memory.

[Effect]

In the magnetic recording and reproducing apparatus according to the present invention, a reproduced still image is reproduced by controlling writing and reading of still image signals to and from a plurality of field memories of an image reproduction system by the memory control means according to a control code recorded on a magnetic tape. It can be switched dynamically according to the audio signal.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic recording and reproducing apparatus according to the present invention will be described in detail below with reference to the drawings.

1 to 5 show an embodiment of a multi-segment PCM recorder to which the present invention is applied, and FIG. The figure is a timing chart for explaining the still image playback operation in the second playback system, and FIG. 3 is a block diagram showing the main part configuration of the recording system of the above embodiment.
FIG. 4 is a schematic diagram for explaining the recording operation of a still image signal by the recording system, and FIG. 5 is a schematic diagram showing the format of a recording track by the recording system.

In the block diagram of FIG. 3 showing the main configuration of the recording system of this embodiment, an input audio signal is supplied from a first signal input terminal 1 to an A/D conversion circuit 3 through a noise reduction (NR) circuit 2. , is digitized by this A/D conversion circuit 3 and supplied to an 8mm PCM signal processing circuit 4. The digitized input audio signal is then processed into a predetermined recording PCM by the 8mm PCM signal processing circuit 4.
The signal is supplied as a signal from the changeover switch 5 to the magnetic head 7 via the recording amplifier 6.

Further, the image signal is supplied from the second terminal 11 to the A/D conversion circuit 13, and is digitized by the A/D conversion circuit 3, and a desired one field or frame is converted into the first
Or it is stored in the second image memory 13, 14. 13. i/
The image signal written in I is read out one horizontal scanning line at a time as a still image signal, and is supplied to the 8 mm PCM (i) processing circuit I5, and the 8 mm I) CM signal-J processing circuit 15.
The PCM signal is converted into a predetermined recording PCM signal and is supplied from the changeover switch 5 to the magnetic head 7 via the recording amplifier 6, and as shown in FIG. The information is sequentially recorded on predetermined segments of each recording track of the tape 8.

By controlling the switching of the changeover switch 7 by a control section (not shown), the PCM audio signal and still image (No. 6) are supplied to the magnetic head 7 for a predetermined period, and a recording format as shown in FIG. Segments are recorded on the tracks of the magnetic tape 8-1- using a cloak.The recording format in this embodiment corresponds to the format of the multi-segment PCM recorder shown in FIG. A first audio signal is recorded in the segment 50, a first still image signal is recorded in the second segment 60, and a second still image signal is recorded in the third segment 70.
A second still image signal is recorded in the fourth segment 80, a third audio signal is recorded in the fifth segment 90, and a third still image signal is recorded in the sixth segment 100.

In the recording format of this embodiment, index areas 58.68.78, 88°98.108 are provided in each guide section for each segment 50.60.70, 80.90.100. Each signal can be recorded.

Then, from the magnetic tape 8 on which the audio signal and the still image signal are recorded in the recording format as described above, the audio signal and the still image signal are recorded. In the block diagram of FIG. 1 showing the configuration of main parts of a reproduction system for reproducing +i image signals, a magnetic head 7
The reproduced output signal reproduced from the magnetic tape 8 is separated from the reproduction amplifier 20 into an audio signal portion and an image signal portion via a changeover switch 21, and is converted into an 8mm PCM for audio signals.
It is selectively supplied to a signal processing circuit 22 and an 8 mm PCM signal processing circuit 26 for image signals.

The audio signal 8mm PCM signal processing circuit 22 demodulates the first audio signal that has been sequentially recorded in a predetermined segment (for example, the first segment 50) from the supplied reproduction output signal, and In addition to supplying the signal to the A conversion circuit 23, the index signal recorded in the index area 58 of the first segment 50 is demodulated and supplied to the control code processing circuit 35. And the above D/A
The analog audio signal obtained by the conversion circuit 23 is outputted from the first signal output terminal 25 via the noise reduction (NR) circuit 24 .

In addition, an 8 mil JPCM signal processing circuit 2 for the above image signal is provided.
6 adjusts the first still image signal, which has been sequentially recorded in a predetermined segment (for example, the second segment 60) from the supplied body output signal, by 1ji, and outputs the same through the first memory switch 27. 1 to 4th field memory 28
．． 29, 30, and 31, and also demodulates the index signal recorded in the index area 68 of the second segment 60 and supplies it to the control code processing circuit 35. The first memory switch 2
A still image signal for one field is written in each of the first to fourth field memories 28, 29, 30, and 31 selected in step 7. The still image signals written in the first to fourth field memories 28.29, 30.31 are transferred to the second memory switch 32.
is selectively read out via the D/A conversion circuit 33, and converted into analog data to be output as the second signal output? +1: Output from end 34.

Note that the first to fourth field memories 28,
29. 3 (1,3N;l, third memory switch 3
With the conversion data supplied from the memory processing circuit 36 via 7, conversion processing can be performed on the contents of the written still image signal.

Further, the control processing circuit 35 decodes a control code included in the index signal supplied from the 8mm PCM signal processing circuit 25 for audio signals or the 8mm PCM signal processing circuit 26 for image signals. First to third memory switches 27, 32, 37
The switching control, that is, the writing/reading control of still image signals to and from the first to third field memories 28, 29, 30, and 31 is performed, for example, as shown in FIG.

In Figure 2, ■■■■ indicates each of the above memory switches (S
a, Sb) 27. The first to fourth field memories 28, 29, 20° 31 selected at 28 are shown, and in this example, the first memory switch (Sa)
27, the first to fourth field memories 28
, 29, 20, and 31 are sequentially selected every 263 field periods to record the second recording track of the magnetic tape 8.
The first still image signals recorded in the segment 60 are sequentially written one screen at a time. For example, while a still image signal is being written to the first field memory 28, the still image signals for three screens written to the other second to fourth field memories 29, 20, and 31 are controlled as described above. The code is selectively read out by the second memory switch (Sb) 28, and the reproduced still image is dynamically switched in accordance with the first audio signal.

By dynamically switching the reproduced still image in accordance with the audio signal as in this embodiment, the still image to be reproduced can be synchronized with the audio signal without monotonous changes in the still image relative to the audio signal. It can have dynamic effects.

〔Effect of the invention〕

As is clear from the description of the embodiments described above, in the magnetic recording and reproducing apparatus according to the present invention, the memory control means writes and writes still image signals to the plurality of field memories of the image reproducing system according to the control code recorded on the magnetic tape. By controlling readout, the reproduced still image is dynamically switched in accordance with the audio signal, so the still image does not change in l'j key with respect to the audio signal, and the reproduced still image does not have the audio ( It is possible to create a dynamic effect that is synchronized with L';]-.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of main parts of a reproduction system of an embodiment of a magnetic recording and reproduction apparatus according to the present invention, and FIG. 2 is a timing chart for explaining a still image reproduction operation in the reproduction system. FIG. 3 is a block diagram showing the main part configuration of the recording system of the above embodiment, FIG. 4 is a schematic diagram for explaining the recording operation of a still image signal by the recording system, and FIG. The figure is a schematic diagram showing the format of a recording track by the above-mentioned recording system. FIG. 6 is a schematic diagram showing the format of a recording track of an 8 mm video tape recorder, and FIG. 7 is a schematic diagram showing the format of a recording track of a multi-segment PCM recorder. 7...Magnetic head 8...Magnetic tape 22.26
...8mm PCM signal processing circuit 23.33...D/
A conversion circuit 25.34...Signal output terminal

Claims (1)

[Claims] Encoded audio signals are recorded and reproduced through a first area of a recording track formed on a magnetic tape in a direction diagonal to the running direction of the magnetic tape. A magnetic recording and reproducing device that records and reproduces encoded still image signals via a second area of a recording track, comprising: a plurality of field memories that store still image signals reproduced from the magnetic tape; A magnetic recording and reproducing apparatus comprising memory control means for controlling writing and reading of still image signals in the plurality of field memories according to recorded control codes.